The health and habits of your new companion bird are very important factors. After you chose which species you feel most comfortable with, find a good Avian Veterinarian nearby. We can not stress the importance of this matter. Your companion will need regular nail, beak, & flight feather trimmings by a qualified Avian Vet.  It's also good advice to have yearly well checks including blood work & cultures. Always take your vet's advice about any supplements or dietary changes. The health and happiness of your bird will depend on them.

Learn your bird's normal habits and behaviors.  If your bird acts or looks differently (e.g. irregular or a big difference in droppings/poop, listless, over-fluffed feathers, staying on the bottom of the cage, nostril or eye discharge or any bleeding), see your vet immediately.  Most birds rarely show obvious symptoms of illness until it is to late.

All companion birds need at least 10 hours of uninterrupted sleep in their cages each night.  They also need vigorous exercise and time out of their cages every day along and some  one-on-one play time with you.

Just about all birds enjoy bathing. It's important to provide a suitably sized shallow container of water that they can bathe in at least once a week ..otherwise you may find your bird trying to bathe in its drinking water and dousing everything around it.

Insure that your birds have clean drinking water daily and fresh food.

Indoor options for bathing your bird are to use a mister (lukewarm water) on them or a shallow container filled not more than half the birds' height in water. There is also a 

attachment for your bathtub. Then they can shower with you or alone. (Don't leave them unsupervised.)

Bathing helps promote normal molting, feather growth and dander.  And, it is one of the ways they play, in nature.